Like hiding a comic book inside the textbook you're supposed to be studying, this handy bookmark ensures you've always got something interesting to read when your book takes a boring turn. It features Shakespeare's complete Hamlet, so reading it can't be considered slacking off since you're still getting a dose of culture.
It was created by Zach Weinersmith and Katie Sekelsky in response to a joke on a t-shirt: "I'm so bookish, my bookmarks are smaller books." Printed in incredibly tiny 1.29 point Hoefler Text font, the average human eye can still recognise names like Hamlet, but you'll probably need a magnifying glass to read the whole thing. Or, try it without and destroy your eyesight for just $7. [SMBC Store via Wired]